Quantum mechanics and classical mechanics may have more similarities than presently known. Some simple concepts of probability theory in quantum mechanics as well as some equations of classical and quantum mechanics are re-examined. Hidden within these equations is the implication that the Planck constant has kinetic and potential coefficients which are modeled as a spring and an LC circuit. The existence of such coefficients is consistent with well-established principles of quantum mechanics. The author presents “mathematical evidence” that had Planck used momentum rather than velocity in his analysis of his experiments on light, many quantum mechanical behaviors could be described in simple classical terms and give readily apparent, simple, physical explanations. Finally, a new experiment is proposed that may provide strong support for the existence of kinetic and potential components of Planck’s constant. This experiment, if successful, may provide a simple physical explanation of quantum entanglement.